摘要
采用透射电镜研究快速凝固Al-Cr-Zr -X (X =Ti,Nb ,Fe,0 )合金的急冷态和各种退火态组织。结果表明 ,在急冷态时 ,Al-Cr -Zr -X (X =Ti,Nb)组织为α -Al固溶体 ,而Al-Cr-Zr-X (X =Fe ,0 )组织为α -Al固溶体加Al1 3Cr2 相 ;在30 0 -4 0 0℃退火时 ,Al-Cr -Zr-X (X =Ti,Nb ,Fe)中有亚稳L1 2 -Al3Zr相和Al1 3Cr2 相从过饱和α -Al固溶体中析出 ;随着温度进一步升高 ,亚稳相L12 -Al3Zr转变为稳定相DO2 3-Al3Zr。由此可见 ,Al -Cr -Zr -X (X =Ti,Nb ,Fe)合金适用于 30 0～40
The AS-spun and AS-annealed microstructure of rapidly solidified Al-Cr-Zr-X (X=Ti,Nb,Fe,0) alloys are investigated by TEM. The results indicate that only α- Al supersaturated solid solution is observed in Al-Cr-Zr-Ti and Al-Cr-Zr-Nb alloys, and Al 13 Cr 2 phase is formed in Al-Cr-Zr-Fe and Al-Cr-Zr alloys, and fine particles of little Al 13 Cr 2 phase and metastable L1 2 -Al 3Zr phase are precipitated from the α-Al supersaturated solid solution in Al-Cr-Zr-X alloys during annealing at 300～400℃ for 3h; when the alloys are heated above 500℃ for 3h.,metastable L1 2 -Al 3Zr phase is transformed to stable DO 23 - Al 3Zr phase. Therefore,Al-Cr-Zr-X (X=Ti,Nb,Fe) alloys are suitable to application at 300～400℃.
出处
《有色金属》
CAS
CSCD
2002年第1期4-7,11,共5页
Nonferrous Metals
基金
安徽省教委自然科学基金项目 ( 2 0 0 0 jl172 )
